// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "net/base/upload_bytes_element_reader.h"

#include <memory>

#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/platform_test.h"

namespace net {

class UploadBytesElementReaderTest : public PlatformTest {
protected:
    void SetUp() override
    {
        const char kData[] = "123abc";
        bytes_.assign(kData, kData + arraysize(kData));
        reader_.reset(new UploadBytesElementReader(&bytes_[0], bytes_.size()));
        ASSERT_EQ(OK, reader_->Init(CompletionCallback()));
        EXPECT_EQ(bytes_.size(), reader_->GetContentLength());
        EXPECT_EQ(bytes_.size(), reader_->BytesRemaining());
        EXPECT_TRUE(reader_->IsInMemory());
    }

    std::vector<char> bytes_;
    std::unique_ptr<UploadElementReader> reader_;
};

TEST_F(UploadBytesElementReaderTest, ReadPartially)
{
    const size_t kHalfSize = bytes_.size() / 2;
    std::vector<char> buf(kHalfSize);
    scoped_refptr<IOBuffer> wrapped_buffer = new WrappedIOBuffer(&buf[0]);
    EXPECT_EQ(
        static_cast<int>(buf.size()),
        reader_->Read(wrapped_buffer.get(), buf.size(), CompletionCallback()));
    EXPECT_EQ(bytes_.size() - buf.size(), reader_->BytesRemaining());
    bytes_.resize(kHalfSize); // Resize to compare.
    EXPECT_EQ(bytes_, buf);
}

TEST_F(UploadBytesElementReaderTest, ReadAll)
{
    std::vector<char> buf(bytes_.size());
    scoped_refptr<IOBuffer> wrapped_buffer = new WrappedIOBuffer(&buf[0]);
    EXPECT_EQ(
        static_cast<int>(buf.size()),
        reader_->Read(wrapped_buffer.get(), buf.size(), CompletionCallback()));
    EXPECT_EQ(0U, reader_->BytesRemaining());
    EXPECT_EQ(bytes_, buf);
    // Try to read again.
    EXPECT_EQ(
        0, reader_->Read(wrapped_buffer.get(), buf.size(), CompletionCallback()));
}

TEST_F(UploadBytesElementReaderTest, ReadTooMuch)
{
    const size_t kTooLargeSize = bytes_.size() * 2;
    std::vector<char> buf(kTooLargeSize);
    scoped_refptr<IOBuffer> wrapped_buffer = new WrappedIOBuffer(&buf[0]);
    EXPECT_EQ(
        static_cast<int>(bytes_.size()),
        reader_->Read(wrapped_buffer.get(), buf.size(), CompletionCallback()));
    EXPECT_EQ(0U, reader_->BytesRemaining());
    buf.resize(bytes_.size()); // Resize to compare.
    EXPECT_EQ(bytes_, buf);
}

TEST_F(UploadBytesElementReaderTest, MultipleInit)
{
    std::vector<char> buf(bytes_.size());
    scoped_refptr<IOBuffer> wrapped_buffer = new WrappedIOBuffer(&buf[0]);

    // Read all.
    EXPECT_EQ(
        static_cast<int>(buf.size()),
        reader_->Read(wrapped_buffer.get(), buf.size(), CompletionCallback()));
    EXPECT_EQ(0U, reader_->BytesRemaining());
    EXPECT_EQ(bytes_, buf);

    // Call Init() again to reset the state.
    ASSERT_EQ(OK, reader_->Init(CompletionCallback()));
    EXPECT_EQ(bytes_.size(), reader_->GetContentLength());
    EXPECT_EQ(bytes_.size(), reader_->BytesRemaining());

    // Read again.
    EXPECT_EQ(
        static_cast<int>(buf.size()),
        reader_->Read(wrapped_buffer.get(), buf.size(), CompletionCallback()));
    EXPECT_EQ(0U, reader_->BytesRemaining());
    EXPECT_EQ(bytes_, buf);
}

} // namespace net
